EP0533425A1 - Heavy duty radial tyre - Google Patents
Heavy duty radial tyre Download PDFInfo
- Publication number
- EP0533425A1 EP0533425A1 EP92308364A EP92308364A EP0533425A1 EP 0533425 A1 EP0533425 A1 EP 0533425A1 EP 92308364 A EP92308364 A EP 92308364A EP 92308364 A EP92308364 A EP 92308364A EP 0533425 A1 EP0533425 A1 EP 0533425A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bead
- carcass
- point
- heavy duty
- tread
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/04—Bead cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/0009—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion
- B60C15/0027—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion with low ply turn-up, i.e. folded around the bead core and terminating at the bead core
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T152/00—Resilient tires and wheels
- Y10T152/10—Tires, resilient
- Y10T152/10495—Pneumatic tire or inner tube
- Y10T152/10819—Characterized by the structure of the bead portion of the tire
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T152/00—Resilient tires and wheels
- Y10T152/10—Tires, resilient
- Y10T152/10495—Pneumatic tire or inner tube
- Y10T152/10855—Characterized by the carcass, carcass material, or physical arrangement of the carcass materials
Definitions
- the present invention relates to a heavy duty radial tyre, in which bead durability and airtightness are improved.
- tubeless tyres are widely used.
- the tensile stress in the carcass produced by the tyre inner pressure is generally radially outward and axially outward.
- the bead core is forced towards the rim flange by the axial component of the tensile stress, which component is in direct proportion to the amount of tyre deflection.
- the radial component increases circumferentially away from the ground contacting patch, and then the axially inside of the bead core is pulled radially outwards.
- an object of the present invention to provide a heavy duty radial tyre, in which, by preventing the bead toe lifting, airtightness and bead durability are improved.
- a heavy duty radial tyre comprises a tread having tread edges, a pair of axially spaced bead portions having a bead base to fit a 15° tapered bead seat of its regular rim, a pair of sidewalls extending between the tread edges and the bead portions, a bead core disposed in each of the bead portions and having a polygonal cross sectional shape, a radial carcass extending between the bead portions and turned up around the bead cores, and a belt disposed radially outside the carcass and radially inside the tread portion, characterised by the polygonal cross sectional shape of the bead core having an axially inner angled point (Q1) and an axially outer angled point (Q2) and a side (L1) extending between the points (Q1 and Q2), the side (L1) being adjacent to and substantially parallel to the bead base, the maximum section width (CW) of the bead core in the
- a heavy duty radial tyre 1 is a tubeless truck/bus radial tyre.
- the tyre 1 has a tread 2, a pair of axially spaced bead portions 4, and a pair of sidewalls 3 extending between the tread edges and the bead portions 4.
- a pair of bead cores 7 is disposed one in each of the bead portions 4.
- a carcass 5 extends between the bead portions 4 and is turned up around the bead cores 7 from the axially inside to the outside to form a pair of turned up portions 5B and a main portion 5A therebetween.
- a belt 6 comprising a plurality of plies, in this embodiment four plies 6A is disposed radially outside the carcass 5 and inside the rubber tread 2.
- Fig.1 shows the normally inflated condition where the tyre 1 is mounted on its regular rim (J), by engagement of a bead base 11 of each region 4, and inflated to its regular inner pressure.
- the rim J is a dropped centre 15° taper rim, which comprises a pair of bead seats 12 each tapered toward the centre of the rim at substantially 15 degrees, a well for tyre mounting between the bead seats 12, and a pair of low flanges 13 each extending radially outwardly from the axially outer edge of each bead seat 12.
- the tyre carcass 5 is made of cords arranged radially at 60 to 90 degrees with respect to the tyre equator CO.
- organic fibre cords e.g. nylon, polyester, aromatic polyamide, aromatic polyester, rayon or the like, carbon fibre cords, or steel cords can be used.
- Each belt ply 6A comprises belt cords arranged parallel to each other, and at least two belt plies are arranged with their respective cords to cross each other and also to cross the carcass ply, so that a triangular construction is formed by the belt cords and carcass cords to reinforce the tread 2 of the tyre.
- organic fibre cords e.g. aromatic polyamide, aromatic polyester, nylon, polyester, rayon or the like or steel cords are used.
- each turned up portion 5B of the carcass 5 has a radially outer edge K extending radially outwardly over the radially outer edge F of the flange 13 of the rim J by a radial distance of 25 to 50 mm.
- Each bead portion 4 is provided between the carcass main portion 5A and the turned up portion 5B with a hard rubber bead apex 9 extending radially outwardly from the bead core 7.
- the bead core 7 has a depressed hexagonal cross-sectional shape having six angled points and six sides.
- the bead core 7 is located such that its major axis (x) (if regarded as an oval) and one side L1 adjacent to the bead base 11 are parallel to the bead base 11.
- the side L1 is substantially parallel to the bead seat surface 12 when the tyre 1 is mounted on the rim J and inflated to its regular inner pressure.
- the bead core 7 has an aspect ratio of 0.3 to 0.6 where the aspect ratio is defined as the ratio (Y/CW) between its maximum section width (CW) in the direction of the major axis (x) or the tapered bead base and its maximum section height (y) in the normal direction to the major axis (x).
- the bead core 7 is formed by winding a steel wire, e.g. a piano wire or the like.
- the maximum section width (CW) is in the range of 0.063 to 0.105 times the rim width (RW) between the bead heel points (P).
- bead heel point (P) is the point of intersection between the bead base line 11 (tapered at 15 degrees) and the bead side face line 14.
- the axial distance (A) between the bead heel point (P) and the angled point (Q1) at the axially inner end of the above-mentioned side (L1) is in the range of 0.073 to 0.125 times the rim width (RW).
- Fig.3 shows the relationship between bead durability and the ratio CW/RW of the maximum section width (CW) to the rim width (RW).
- Fig.4 shows the relationship between bead durability and the ratio A/RW of the axial distance (A) to the rim width (RW).
- the angle ⁇ 1 of a tangential line (T1) to the carcass 5 at a point (R) is set to be not more than 55 degrees with respect to the axial direction.
- the point (R) is on the axially inside of the carcass 5 at the same axial position as the above-mentioned axially inner angled point (Q1) of the bead core 7.
- Fig.5 shows the tangential angle variation ⁇ 3- ⁇ 1 when the tyre inner pressure is increased from 0.5 kgf/sq.cm to the regular inner pressure, where the carcass 5, the tangential line T1, the point R, and the tangential angle ⁇ 1 are at the regular pressure, and 5a, T1a, Ra and ⁇ 3 are at 0.5 kgf/sq.cm.
- the lifting amount increased in substantially direct proportion to the increase in the tangential angle variation ⁇ 3- ⁇ 1.
- the tangential angle increases as the tyre inner pressure increases to the regular inner pressure from 0.5 kgf/sq.cm. Therefore, the compressive stress to which the bead portion 4 is subjected under a loaded condition becomes large and the bead durability is liable to decrease.
- the tangential angle ⁇ 1 is preferably in the range of 55 to 47 degrees.
- Truck/bus radial tyres of size 11R22.5 having the structure shown in Figs.1 and 2 and specifications set out in Table 1 were prepared.
- test tyre was mounted on its regular rim and inflated to its regular inner pressure and then tested for bead toe lifting and bead durability.
- the running distance till the bead portion was cracked and/or air leakage occurred was measured using a drum tester under an inner pressure of 8 kgf/sq.cm, a tyre load of 6000 kg, and a speed of 20 km/hr.
- various shapes can be used as, for example, shown as 7A to 7G in Fig.8, in addition to the hexagonal shape shown in Figs.1 and 2.
- the present invention can be applied to tubed tyres in addition to tubeless radial tyres.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
Description
- The present invention relates to a heavy duty radial tyre, in which bead durability and airtightness are improved.
- For heavy vehicles, e.g. bus, truck and the like, tubeless tyres are widely used.
- In such a heavy duty tyre, the engaging force between the tyre beads and the bead seats of the rim must be large to maintain airtightness.
- This is particularly important when the tyre load and inner pressure are very large. However, as shown in Fig.10, so called bead toe lifting (f) has been often observed, a phenomena in which the bead toe (a) is lifted from the bead seat (b) even though the tyre is mounted on its regular rim and inflated to normal pressure and loaded to its normal load.
- It was found that such toe lifting reduces not only airtightness but also bead durability.
- Further, it was found that bead durability decreases in proportion to the increase in the amount (L) of bead toe lifting (f) as shown in Fig.9.
- In the tyres in which bead toe lifting occurred, the larger the service pressure, the greater the bead toe lifting. Accordingly, the deformation of the bead portion was larger, and damage occurred earlier.
- In the bead portion, the tensile stress in the carcass produced by the tyre inner pressure is generally radially outward and axially outward.
- Therefore, in the ground contacting patch of the tyre, the bead core is forced towards the rim flange by the axial component of the tensile stress, which component is in direct proportion to the amount of tyre deflection.
- On the other hand, the radial component increases circumferentially away from the ground contacting patch, and then the axially inside of the bead core is pulled radially outwards.
- The direction of the resultant force to which the bead core is subjected is changed during running. Therefore, the axially outward bead rubber portion is compressed axially by the axially outward movement of the bead core and radially by the radially inward movement of the carcass turned up portion.
- On the other hand, the axially inward bead rubber portion is pulled by the carcass main portion.
- As a result, under heavy load and high pressure conditions, the bead rubber is subjected to a repeated large stress, and the rubber is permanently deformed.
- Accordingly, the airtightness between the tyre beads and the bead seats of the rim is decreased.
- Further, such permanently deformed rubber is liable to be cracked especially at points in the radially outward bead rubber region near the carcass ply turnup edge and the radially outer edge of the rim flange. The bead durability is greatly decreased by such a crack.
- It is therefore, an object of the present invention to provide a heavy duty radial tyre, in which, by preventing the bead toe lifting, airtightness and bead durability are improved.
- According to one aspect of the present invention, a heavy duty radial tyre comprises a tread having tread edges, a pair of axially spaced bead portions having a bead base to fit a 15° tapered bead seat of its regular rim, a pair of sidewalls extending between the tread edges and the bead portions, a bead core disposed in each of the bead portions and having a polygonal cross sectional shape, a radial carcass extending between the bead portions and turned up around the bead cores, and a belt disposed radially outside the carcass and radially inside the tread portion, characterised by the polygonal cross sectional shape of the bead core having an axially inner angled point (Q1) and an axially outer angled point (Q2) and a side (L1) extending between the points (Q1 and Q2), the side (L1) being adjacent to and substantially parallel to the bead base, the maximum section width (CW) of the bead core in the direction parallel to the side (L1) being in the range of 0.063 to 0.105 times the rim width (RW) between the bead heel points (P) of the design rim, the axial distance (A) of the axially inner point (Q1) from the bead heel point (P) being 0.073 to 0.125 times the rim width (RW).
- An embodiment of the present invention will now be described in detail in conjunction with the accompanying drawings, in which:
- Fig.1 is a cross sectional view showing a right half of a tyre according to the present invention;
- Fig.2 is an enlarged cross sectional view of the bead portion thereof;
- Fig.3 is a graph showing bead durability as a function of the quotient CW/RW;
- Fig.4 is a graph showing bead durability as a function of the quotient A/RW;
- Fig.5 is a cross sectional view of a bead showing the deformation thereof caused during tyre inflation;
- Fig.6 is a graph showing the amount of bead toe lifting as a function of tangential angle variation ϑ3-ϑ1;
- Fig.7 is a graph showing the tangential angle variation ϑ3-ϑ1 as a function of the tangential angle ϑ1;
- Fig.8 shows other examples of cross sectional shape of the bead core;
- Fig.9 is a graph showing bead durability as a function of the amount of bead toe lifting; and
- Fig.10 is a cross sectional view showing a prior art tyre.
- In Figs.1-5, a heavy duty
radial tyre 1 according to the invention is a tubeless truck/bus radial tyre. - The
tyre 1 has atread 2, a pair of axially spacedbead portions 4, and a pair ofsidewalls 3 extending between the tread edges and thebead portions 4. - A pair of
bead cores 7 is disposed one in each of thebead portions 4. Acarcass 5 extends between thebead portions 4 and is turned up around thebead cores 7 from the axially inside to the outside to form a pair of turned upportions 5B and amain portion 5A therebetween. Abelt 6 comprising a plurality of plies, in this embodiment fourplies 6A is disposed radially outside thecarcass 5 and inside therubber tread 2. - Fig.1 shows the normally inflated condition where the
tyre 1 is mounted on its regular rim (J), by engagement of abead base 11 of eachregion 4, and inflated to its regular inner pressure. - The rim J is a dropped
centre 15° taper rim, which comprises a pair ofbead seats 12 each tapered toward the centre of the rim at substantially 15 degrees, a well for tyre mounting between thebead seats 12, and a pair oflow flanges 13 each extending radially outwardly from the axially outer edge of eachbead seat 12. - The
tyre carcass 5 is made of cords arranged radially at 60 to 90 degrees with respect to the tyre equator CO. - For the carcass cords, organic fibre cords, e.g. nylon, polyester, aromatic polyamide, aromatic polyester, rayon or the like, carbon fibre cords, or steel cords can be used.
- Each
belt ply 6A comprises belt cords arranged parallel to each other, and at least two belt plies are arranged with their respective cords to cross each other and also to cross the carcass ply, so that a triangular construction is formed by the belt cords and carcass cords to reinforce thetread 2 of the tyre. - For the belt cords, organic fibre cords, e.g. aromatic polyamide, aromatic polyester, nylon, polyester, rayon or the like or steel cords are used.
- Preferably, each turned up
portion 5B of thecarcass 5 has a radially outer edge K extending radially outwardly over the radially outer edge F of theflange 13 of the rim J by a radial distance of 25 to 50 mm. - Each
bead portion 4 is provided between the carcassmain portion 5A and the turned upportion 5B with a hardrubber bead apex 9 extending radially outwardly from thebead core 7. - In this embodiment, the
bead core 7 has a depressed hexagonal cross-sectional shape having six angled points and six sides. - The
bead core 7 is located such that its major axis (x) (if regarded as an oval) and one side L1 adjacent to thebead base 11 are parallel to thebead base 11. - Therefore, the side L1 is substantially parallel to the
bead seat surface 12 when thetyre 1 is mounted on the rim J and inflated to its regular inner pressure. - The
bead core 7 has an aspect ratio of 0.3 to 0.6 where the aspect ratio is defined as the ratio (Y/CW) between its maximum section width (CW) in the direction of the major axis (x) or the tapered bead base and its maximum section height (y) in the normal direction to the major axis (x). - The
bead core 7 is formed by winding a steel wire, e.g. a piano wire or the like. - The maximum section width (CW) is in the range of 0.063 to 0.105 times the rim width (RW) between the bead heel points (P).
- Here, the bead heel point (P) is the point of intersection between the bead base line 11 (tapered at 15 degrees) and the bead
side face line 14. - Further, the axial distance (A) between the bead heel point (P) and the angled point (Q1) at the axially inner end of the above-mentioned side (L1) is in the range of 0.073 to 0.125 times the rim width (RW).
- Fig.3 shows the relationship between bead durability and the ratio CW/RW of the maximum section width (CW) to the rim width (RW).
- When the width (CW) is less than 0.063 times the rim width (RW), the movement of the bead portion against the rim increases and bead durability is reduced.
- On the other hand, when the quotient CW/RW is more than 0.105, tyre to rim mounting becomes too difficult.
- Fig.4 shows the relationship between bead durability and the ratio A/RW of the axial distance (A) to the rim width (RW).
- When the distance (A) is less than 0.073 times the rim width (RW), a
rubber layer 16 disposed axially outside the carcass tuned upportion 5B becomes liable to be cracked and bead durability is decreased. - In this embodiment, in the
bead portion 4 under the normally inflated condition, the angle ϑ1 of a tangential line (T1) to thecarcass 5 at a point (R) is set to be not more than 55 degrees with respect to the axial direction. - Here, the point (R) is on the axially inside of the
carcass 5 at the same axial position as the above-mentioned axially inner angled point (Q1) of thebead core 7. - The effectiveness of this is shown in the following test results.
- Fig.5 shows the tangential angle variation ϑ3-ϑ1 when the tyre inner pressure is increased from 0.5 kgf/sq.cm to the regular inner pressure, where the
carcass 5, the tangential line T1, the point R, and the tangential angle ϑ1 are at the regular pressure, and 5a, T1a, Ra and ϑ3 are at 0.5 kgf/sq.cm. - The tangential angles ϑ1 and ϑ3 and the amount of the bead toe lifting were measured by an X-ray CT-scanner. The results are shown in Fig.6.
- As shown in Fig.6, when the tangential angle variation ϑ3-ϑ1 was less than 2.5 degrees, the amount (L) of toe lifting was substantially zero.
- When the variation was more than 2.5 degrees, the lifting amount increased in substantially direct proportion to the increase in the tangential angle variation ϑ3-ϑ1.
- Further, it was shown that the tangential angle variation ϑ3-ϑ1 is in direct proportion to the tangential angle ϑ1 as shown in Fig.7.
- Therefore, by setting the tangential angle ϑ1 less than 55 degrees the tangential angle variation ϑ3-ϑ1 was kept to less than 2.5 degrees. As a result, the amount of bead toe lifting is substantially zero.
- If the tangential angle ϑ1 was less than 47 degrees, then the tangential angle variation ϑ3-ϑ1 became a negative value, as shown in Fig.7.
- In this case, the tangential angle increases as the tyre inner pressure increases to the regular inner pressure from 0.5 kgf/sq.cm. Therefore, the compressive stress to which the
bead portion 4 is subjected under a loaded condition becomes large and the bead durability is liable to decrease. - Therefore, the tangential angle ϑ1 is preferably in the range of 55 to 47 degrees.
- Truck/bus radial tyres of size 11R22.5 having the structure shown in Figs.1 and 2 and specifications set out in Table 1 were prepared.
- Each test tyre was mounted on its regular rim and inflated to its regular inner pressure and then tested for bead toe lifting and bead durability.
- In the durability test, the running distance till the bead portion was cracked and/or air leakage occurred was measured using a drum tester under an inner pressure of 8 kgf/sq.cm, a tyre load of 6000 kg, and a speed of 20 km/hr.
-
- It was confirmed from the test results that the working example tyres were effectively prevented from toe lifting and improved in durability in comparison with the reference tyres.
- In the present invention, for the sectional shape of the bead core, various shapes can be used as, for example, shown as 7A to 7G in Fig.8, in addition to the hexagonal shape shown in Figs.1 and 2. The present invention can be applied to tubed tyres in addition to tubeless radial tyres.
Claims (5)
- A heavy duty radial tyre comprising a tread (2) having tread edges, a pair of axially spaced bead portions (4) having a bead base (11) to fit a 15° tapered bead seat (12) of its regular rim (J), a pair of sidewalls (3) extending between the tread edges and the bead portions (4), a bead core (7) disposed in each of the bead portions (4) and having a polygonal cross sectional shape, a radial carcass (5) extending between the bead portions (4) and turned up around the bead cores (7), and a belt (6) disposed radially outside the carcass (5) and radially inside the tread (2), characterised by the polygonal cross sectional shape of the bead core (2) having an axially inner angled point (Q1) and an axially outer angled point (Q2) and a side (L1) extending between the points (Q1 and Q2), the side (L1) being adjacent to and substantially parallel to the bead base (11), the maximum section width (CW) of the bead core (7) in the direction parallel to the side (L1) being in the range of 0.063 to 0.105 times the rim width (RW) between the bead heel points (P) of the design rim, the axial distance (A) of the axially inner point (Q1) from the bead heel point (P) being 0.073 to 0.125 times the design rim width (RW).
- The heavy duty radial tyre according to claim 1, characterised in that the aspect ratio (y/CW) of the cross sectional shape of the bead core (7) is in the range of 0.3 to 0.6.
- The heavy duty radial tyre according to claim 1 or 2, characterised in that the cross sectional shape of the bead core (7) is a hexagon.
- The heavy duty radial tyre according to claim 1, 2 or 3, characterised in that in each bead portion (7) the tangential angle (ϑ1) of the carcass at a point (R) is not more than 55 degrees with respect to the tyre axial direction where the point (R) is on the axially inner side of the carcass (5) at the same axial position as the axially inner angled point (Q1) of the bead core (7).
- The heavy duty radial tyre according to claim 4, characterised in that the tangential angle (ϑ1) is in the range of 55 to 47 degrees with respect to the tyre axial direction.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3267043A JP2695716B2 (en) | 1991-09-17 | 1991-09-17 | Radial tires for heavy loads |
JP267043/91 | 1991-09-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0533425A1 true EP0533425A1 (en) | 1993-03-24 |
EP0533425B1 EP0533425B1 (en) | 1995-06-28 |
Family
ID=17439252
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92308364A Expired - Lifetime EP0533425B1 (en) | 1991-09-17 | 1992-09-15 | Heavy duty radial tyre |
Country Status (4)
Country | Link |
---|---|
US (1) | US5423366A (en) |
EP (1) | EP0533425B1 (en) |
JP (1) | JP2695716B2 (en) |
DE (1) | DE69203189T2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0673793A1 (en) * | 1994-03-25 | 1995-09-27 | Continental Aktiengesellschaft | Vehicle tyre |
EP0749855A1 (en) * | 1995-06-19 | 1996-12-27 | Sumitomo Rubber Industries Limited | Heavy duty radial tyre |
US6877538B2 (en) * | 2002-11-25 | 2005-04-12 | The Goodyear Tire & Rubber Company | Tire with new bead bundle |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2781542B2 (en) * | 1995-06-19 | 1998-07-30 | 住友ゴム工業株式会社 | Radial tires for heavy loads |
JP3431847B2 (en) * | 1998-12-22 | 2003-07-28 | 住友ゴム工業株式会社 | Pneumatic tire |
JP2002079812A (en) * | 2000-06-22 | 2002-03-19 | Bridgestone Corp | Assembly of tire and rim, pnuematic tire and tire rim |
FR2942745B1 (en) * | 2009-03-04 | 2013-02-22 | Michelin Soc Tech | PNEUMATIC FOR HEAVY VEHICLE. |
JP5387423B2 (en) * | 2010-01-21 | 2014-01-15 | 横浜ゴム株式会社 | Pneumatic tire |
JP6638389B2 (en) * | 2015-12-25 | 2020-01-29 | 横浜ゴム株式会社 | Pneumatic tire |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1127147A (en) * | 1954-09-29 | 1956-12-10 | Firestone Tire & Rubber Co | Pneumatic |
FR2374173A1 (en) * | 1976-12-20 | 1978-07-13 | Pirelli | IMPROVEMENTS TO RADIAL TIRE HEELS |
EP0013194A1 (en) * | 1978-11-27 | 1980-07-09 | MICHELIN & CIE (Compagnie Générale des Etablissements Michelin) Société dite: | Radial carcass pneumatic tire |
GB2187146A (en) * | 1986-02-20 | 1987-09-03 | Bridgestone Corp | Pneumatic radial tire |
FR2658126A1 (en) * | 1990-01-12 | 1991-08-16 | Goodyear Tire & Rubber | Assembly forming a bead core for a lorry tyre, lorry tyre comprising such an assembly and method for producing such an assembly |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1394941A (en) * | 1964-02-26 | 1965-04-09 | Fr Du Pneu Englebert Soc | Bead for tire beads |
IT1065046B (en) * | 1976-12-13 | 1985-02-25 | Pirelli | HEAD FOR TUBELESS AND RELATED TIRE TYPE TIRES |
JPS5413108A (en) * | 1977-06-29 | 1979-01-31 | Sumitomo Rubber Ind | Bead structure of steel tire |
JPS5747203A (en) * | 1980-09-05 | 1982-03-18 | Bridgestone Corp | Pneumatic flat radial tire for heavy load |
JPS57191104A (en) * | 1981-05-17 | 1982-11-24 | Toyo Tire & Rubber Co Ltd | Radial tire for truck and bus |
JPS58112810A (en) * | 1981-12-28 | 1983-07-05 | Yokohama Rubber Co Ltd:The | Pneumatic tyre |
JPS629442A (en) * | 1985-07-05 | 1987-01-17 | Nec Corp | Error detecting circuit |
JPS62155108A (en) * | 1985-12-27 | 1987-07-10 | Bridgestone Corp | Pneumatic radial tire |
JP2503032B2 (en) | 1987-10-24 | 1996-06-05 | 株式会社ブリヂストン | Pneumatic radial tires for heavy loads |
JP2855327B2 (en) * | 1987-12-15 | 1999-02-10 | 横浜ゴム株式会社 | Pneumatic radial tire |
JPH0253616A (en) * | 1988-08-16 | 1990-02-22 | Sumitomo Rubber Ind Ltd | Heavy load and high speed radial tire |
JPH04173408A (en) * | 1990-11-07 | 1992-06-22 | Sumitomo Rubber Ind Ltd | Tubeless radial tire for heavy load |
-
1991
- 1991-09-17 JP JP3267043A patent/JP2695716B2/en not_active Expired - Fee Related
-
1992
- 1992-09-15 EP EP92308364A patent/EP0533425B1/en not_active Expired - Lifetime
- 1992-09-15 DE DE69203189T patent/DE69203189T2/en not_active Expired - Lifetime
- 1992-09-16 US US07/945,704 patent/US5423366A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1127147A (en) * | 1954-09-29 | 1956-12-10 | Firestone Tire & Rubber Co | Pneumatic |
FR2374173A1 (en) * | 1976-12-20 | 1978-07-13 | Pirelli | IMPROVEMENTS TO RADIAL TIRE HEELS |
EP0013194A1 (en) * | 1978-11-27 | 1980-07-09 | MICHELIN & CIE (Compagnie Générale des Etablissements Michelin) Société dite: | Radial carcass pneumatic tire |
GB2187146A (en) * | 1986-02-20 | 1987-09-03 | Bridgestone Corp | Pneumatic radial tire |
FR2658126A1 (en) * | 1990-01-12 | 1991-08-16 | Goodyear Tire & Rubber | Assembly forming a bead core for a lorry tyre, lorry tyre comprising such an assembly and method for producing such an assembly |
Non-Patent Citations (1)
Title |
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PATENT ABSTRACTS OF JAPAN vol. 7, no. 217 (M-245)(1362) 27 September 1983 & JP-A-58 112 810 ( YOKOHAMA GOMU K.K. ) 5 July 1983 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0673793A1 (en) * | 1994-03-25 | 1995-09-27 | Continental Aktiengesellschaft | Vehicle tyre |
EP0749855A1 (en) * | 1995-06-19 | 1996-12-27 | Sumitomo Rubber Industries Limited | Heavy duty radial tyre |
US5772811A (en) * | 1995-06-19 | 1998-06-30 | Sumitomo Rubber Industries, Ltd. | Heavy duty radial tire with specified bead core inside diameter |
US6877538B2 (en) * | 2002-11-25 | 2005-04-12 | The Goodyear Tire & Rubber Company | Tire with new bead bundle |
Also Published As
Publication number | Publication date |
---|---|
DE69203189D1 (en) | 1995-08-03 |
EP0533425B1 (en) | 1995-06-28 |
DE69203189T2 (en) | 1995-11-02 |
US5423366A (en) | 1995-06-13 |
JPH0577614A (en) | 1993-03-30 |
JP2695716B2 (en) | 1998-01-14 |
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